Re: Apple II emulator for GS/OS

[supertimer@aol.com (Supertimer)]

Rubywand <rubywand@swbell.net> wrote:

>Supertimer writes ...
>> 
>> I'm wondering about the feasability of the title of this post.
>> Since the IIGS has a 65C02 compatible processor, it
>> would not be a full emulator, but you get the picture.  I'm
>> wondering if it is possible to write a GS/OS program that
>> will read in the .dsk images used by emulators that run
>> on Macs and Win/DOS PCs
>
>     It is probably not necessary that an emulator run _under_ GS/OS-- like,
>what does a IIe, //c, etc. care about GS/OS anyway? It could be launched from
>GS/OS (or ProDOS 8) and start GS/OS (or whatever) upon exit.
>
>     A challenge in running dsks under any emu on the GS is preventing damage
>to hard disk, Zip disk, etc. files. Just running ProDOS dsks is no good
because
>most dsks are DOS 3.3, a speeded DOS 3.3, or some semi-deprotected weird DOS.
>The required checking would take a chunk out of your speed.

I'm basically interested in a "DSK Launcher" for the IIGS and or
IIe.  If you look at a dsk image in a file editor and compare it to
a DOS 3.3 Launcer image, they are almost identical.  The difference
appears to be the order the tracks/sectors are stored.  This is
not surprising because DOS 3.3 Launcher images are identical
to the images used by the II in a Mac emulator.  The catch is this
emulator is no longer supported and pretty much forgotten.  It
should be possible, however, to write a DOS 3.3 Launcher type
program for the slightly different dsk format.

It is worthwhile to note that DOS 3.3 Launcher also supports the
speeded up DOS 3.3s.